Improved subtitle conversion.
Improved subtitle conversion.

- Subtitle conversion now preserves more formatting.
- No longer uses HTML::TokeParser as it this made it difficult to extract
  text and preserve formatting.
- Subtitles which start at 0 (i.e. start of the video) are handled
  correctly.

vladrich/get-flash-videos,njtaylor/get-flash-videos,vladrich/get-flash-videos,monsieurvideo/get-flash-videos,karjonas/get-flash-videos,monsieurvideo/get-flash-videos,momo-i/get-flash-videos,njtaylor/get-flash-videos,njtaylor/get-flash-videos,momo-i/get-flash-videos,vladrich/get-flash-videos,karjonas/get-flash-videos,karjonas/get-flash-videos,pcwalden/get-flash-videos,pcwalden/get-flash-videos,pcwalden/get-flash-videos,momo-i/get-flash-videos,monsieurvideo/get-flash-videos